One Piece is the ultimate treasure, located in the hardest spot to get to in the world, or is it? Recently, the Straw Hats left Dressrosa and arrived at Zou. Both places are inhabited with some sort of intelligent being (Zou's people may not be humans). If this continues, or even if it doesn't, wouldn't it be really easy for these people to check Raftel for One Piece?
I understand this makes for a better story, but isn't that a serious flaw?